Improvement in telegraph-insulators



S. MOKEE.

INSULATOR FOR TELEGRAPH WIRE.

NO.107,075. Patented Sept. 6, 1870.

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SAMUEL McKEE, OF, PITTSBURG, PENNSYLVANIA.

Letters Patent No. 107,07 5, dated Sqrtembor 6, 1870.

IMPROVEMENT IN TELEGRAPH-INSULATORS.

The Schedule referred to in then Letters Patent and making part of thelame To all whom it may concern:

Be it known that I, Samoan MoKnn, of the firm of S. MCKEE 8t 00., No. 62 Water street, Pittsburg, in the county of Allegheny and State of Pennsylvania, have invented a new and useful article of manufacture, viz: A Glass Insulator for Insulating Telegraph Wires; and I do hereby declare that the following is a full, clear, and exact description thereof, reference being had to the accompanying drawing and to the letters of reference marked thereon.

The nature of my invention consists in a new article of manuihcture,'\'iz: a glassinsnlator for telegraph wires, saidiusulator beingprovided with two enlargmcnts and a groove for the wire, and projections for turning itwhen screwing it into or unscrewing it out of its support-s, said insulator being about a uniform thickness, for the more perfect annealing of the glass, and for preventing its breaking'hy the diiference in the expansion and construction of the several parts of it.

In the accompanying drawing which forms part of my specification- Figure l is insulators.

Figure 2 is a longitudinal and vertical section of the same.

Figure 3 is an end view of the same.

In the accompanying drawing- A represents the body of the insulator, which is made hollow. The contour of its interior and exterior portion is clearly shown in figs. 1 and 2.

B represents screw-threads, which are arranged on the surface of the body A.

These screw-threads are used for the purpose of securing the insulator in the. telegraph-poles, its crossa side elevation of my improvement in piece, or in other place or thing used for the purposeot suspending telegraph-wires.

G yepresents a groove in the insulator, the telegraph-wire in the desired position.

D are projections or lugs formed on the outer surface and near the outer end of the insulator, and are used in connectioni with asuitable wrench or other dc vice for turning the insulator during the process of screwing it into the opening or place made for receiving it," the opening for the reception of the insulator in the telegraph-pole, its cross-piece, or other place or thing used foususpending the telegraph-wire, should be just equal in diameter to the diameter of the body A of the insulator, so--thatits screw-threads B will for holding take a strong hold in the walls of the openingin which the body A is to be secured.

The means used for manufacturing my improvement in insulators i leave to the judgment and skill of the mechanic.

I do not claim an insulator with screw-threads on the body of it, nor with scnew-threads-in the interior of the body, such device being well known.

Having thus described the nature and construction of my improvement,

What 1 claim as of my invention is-- A new article of manufacture, viz: a glass insula tor, the body A provided with two enlargements, a; and x, and groove. being of about a uniform thickness, the whole being constructed substantially as here-in described and for the purpose set forth,

SAML. MOKEE. Witnesses:

ANDREW HUMBERT, E. V. MCOANDLESS.

(l and projections D, the body A. 

